Abstract
This study evaluates the validity and factorial structure of the affective job satisfaction scale (BIASJ) among 234 workers from private institutions of social solidarity (IPSS) in Portugal. Emotional job satisfaction, a key marker of psychological well-being, is associated with positive outcomes for employees and organizations. The sample was mainly female, with an average age of 39.15 years (SD = 8.22). The BIASJ and Maslach burnout inventory (MBI) measured job satisfaction and burnout. The BIASJ demonstrated high internal consistency (Cronbach's alpha = 0.87, McDonald's omega = 0.88) and a unidimensional structure. Significant negative correlations with emotional exhaustion and depersonalization supported its criterion validity. The results confirm the BIASJ as a reliable instrument for assessing job satisfaction in IPSS settings in Portugal. Future research should incorporate more diverse, gender-balanced samples and utilize probability sampling to improve generalizability.